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Now, as regards those who assign corporeity to the soul, it suffices to recall the argument of Ammonius, the master of Plotinus, and of Numenius the Pythagoraean. It runs thus:

Bodies, by their absolute nature, are mutable, dissoluble, and, throughout their extent, divisible indefinitely, without their remaining anything of body that is not thus liable to change. Therefore a body requires some principle keeping it together, assembling its constituents, and (so to speak) binding and holding them in union. And this principle we call soul. But if the soul is, in any kind of way, corporeal, even though its body were of the most rarefied stuff, the question is, what is the principle that holds it together? For it has been demonstrated that everything corporeal needs a principle of cohesion. And so the argument is carried back indefinitely, until we arrive at an incorporeal soul.

(Nemesius of Emesa on the Nature of Man XII, as translated by William Telfer.)